Rock-drill.



PATENTED JUNE 5, 1906.

A. H. GIBSON.

ROOK DRILL.,

APPLICATION FILED DBO. 2l, 1905.

2 SHEETSSHBET l,

Jifewuj PATENTED JUNE 5, 1906.

A. H. GIBSON.

ROCK DRILL.

APPLICATION F'ILED DEG.21,1905.

2 SHEETS-SHEET 2.

A-io ments in that class of rock-drills in which the 'r 5 closedtail-rod `chamber into 'open communi- 2o represents thedrill infside elevatlon 1n con- 2 5. being shown broken away, Fig. 2 is a detail 3o. vposition to open' communication from: the lin- -4ojsection showing ,the manually-operated valve UNTTED .STATES .PATE-NT" Oni-non.'

`IARTH'UR H. GIBSON,OFEASTON,..PENNSYLVAN1A,AssicNOR TO- INGER--- SOLL-RAND; COMPANY, .OF NEW NEW JERSEY.

seciamion "of Leef-ers' Patent.

YORK, N. A CORPORATION OF hoek-DRILL.

" rammed .rime 5,1906;

.. ippximinnnea Dminb 21,1905. serai- 1a. 292.75@

- l My invention consists incertain improvef1 U ills fare operated-by.reciprocating columns oiair;` yThe objectofmy inventif@ is to provide .mamially-operated means bringing vthe 1 cationwith one of the Huid-pressure pipes or the atmosphere at pleasure for ycontrollingthe operatlon of the drill. In the'accompanying drawings, Figure v1 nection with an air-pressor of any Well-known or approved construction, the pressor being shown in longitudinal -central sectionand the flexible pipes which connect it with the drill view 1n vlongitudinal central section of.. the l drill, the iston, the liront -rod, rand a'portion of they ta' -rod` being shown in side elevation,

' the manually-operated valve being shown in terior' of the tail-rod' .chamber to one of the'L fluid-pressure' pi es.l Fig.l 3 is a top. plan vievv of the too -cylinder, a portion of' the samefbemgbroken -away to. 'more clearly '35.- showthe manually-operated valve for bring- .ing the interior of the tail-rod chamber either into communication with one of the 1 uidpressure-pipeswor the atmosphere. Fig. 4 isa .Tear view ofthe same, and. Fig.` 5 is adetail position't'o 'pen' the'jnterior of the tail-rod chamber to theatmospheref, Anfelectro neumatic pressor'iss'hownior trunlgfpistonfby 3. Flexible pi .ese and .-5 read from-the spaces 6 and 'fatvt "effront and .j back 'ofthepiston 3 tothe s aces 8 andat.

the' back 'an front ofy tle too -pistoniO inthe 5o cy1mder 11. ylinder 11. has a front head 1-2 and a rear'headextension 13. j The head ofthe tool-.piston is rovided with 'the .usual front rod 14, whic passes .from the tail-ro starts cuits-rearward rrio'wrem'ent.

through, .the 'front head .'12, and is providedwith a chuck T for the attachment of the. .drill-tool. lThis piston-headis also provided with a 'hollow rearwardly-extended 'tail-rod' 16, which is fitted to slide in a sleeve 17 in the rear'he'ad extension 13, the Walls of which sleeve 17 are'sp'aced from `the-Walls of .the -rear head extension sufficiently to forina passage 18.

Arifle-barli) is arranged to telescopevvithinf the tail-rod 1.6 in engagement `with the ing movementlto the dril which. rifle-bar; f' maybe rotated step by fstep by `any suitable mechanism. (Not shown specifically herein.)

A tail-rod chamber 20 is formed back of l the tail-rod .within the hollowysleeve 17 7'0' which chamber is connected Withthepassage `l8by means of holes 21 through thelWalls-of lthe sleeve a short distance'romithe rear end ofthe said tail-rod chamber.

A passage 22 leads from thepipe 4 tothe face of a manuall ,-operated valve 23, ,provided With a suit- -abelhandle 24. Passages 2526 leadrom the atmosphere'and from the assage 18,v respectively, to the face of the va v e 23, and the.

valve A23 is rovided with a port 27, so arrangedythat'it maybring the pass e 26 into open communication with the iiui -pressure pipe 4 or into communication with the as'- sage 25, and thereby thev atmosphere, at p easure. i

. 85 vThe manually-operatedvalvc 23 isfr'iction.- a

ally'held in any desired position by means of a spring28,l which is" inte 4osed between the innerf end oflthe'valve an a suitable'removable cap 29;" A' delectorBO is also provided for the assage `or directing theair/laterv ally. dditional holes '31 are provided in thesleeve 17'v at'a distanceto the front of. the holesv 21, so as to 've a free release of the air ,y

chamber as thetail-rod It is to be understood that the passa es 22, 'f

26, and l8 `and'holes 21 and 31 are o suli-l cient size topermit a free reci ro'c'ation of the airtherethrough When the va ve 23 istur'ned' intotheproper osition'ito bring 'the interior rooy 'of the'tall-rod c amber `into communication withthe fluid-pressure pipe 4. j It' also to be understood that the pas- `sag'e125 is of ample size to permit the free'es- .cape'and intake of the air when the valve 23 cation with the atmosphere.

is turned into position 13o-bring vthe vinterior ofthe tail-rod chamber into open communil In operation When the valvev2-3 is turned into` position to bring the tail-rod chamber into open communication with the Huid-pres,-

' sure pipe 4 and the pressor is` moved in div [lo been possible.

f 1. A tool-piston having a front rod and aA tail-rod, a cylinder having a tail-rod ehain rection to drive the tool-piston forwardly the pressure of air vmwill be' not only brought againsty the crossseotional area of the piston,

but Will also bebrought against the cross sectional areaof the tail-rod, thus causing thel than has heretofore' drill to hit a harder-blow If the drill should stick in lthe hole, the

. valve 23 may be turned into position to bring' the tail-rod chamber into o en communicav tion with the atmosphere, t us withdrawing some of the back pressure on thepiston and permitting the piston to be more yreadily moved rearwardly by the column of air in the pipe 5.

What i Claim is'- tail-rod, a cylinder having a tail-rod chamber, pipes for feeding motive iiuid alternately, to

' the opposite sides ofthe piston and a single lmeans for bringing the tail-rod chamber into lopen communication with the pipe which effects the forward stroke of the tool or to the atmosphere at pleasure.

3. A tool-piston having a front rod and a tail-rod, a Cylinder having a tail-rod chamber,

pipes for feeding motive fluid alternately to the opposite sides of the piston and a manually-operated valve for bringing the tailerod chamber 'into Communication with one of the pipes or the atmosphere, at pleasure.

4, A tool-piston having a front rod and "a .tail-rod, a cylinder having atail-.rod chamber,

pipes for feeding motive iiuid alternately to the opposite sides of the piston and a manu- .'ally-operated valve for bringing the `tail-rod chamberinto communication with the pipe which e'eots lthe lforward stroke of the tool or to the atmosphere. at pleasure.

Inl testimony that I claim the fore-goingv as I my invention I have signed my name7 1n presence of tWo Witnesses, .this 13th day of December, 1905.

A ARTHUR H. GIBSON.

Witnesses FREDK. HAYNEs, g C. S. SUNDGREN. 

